I've been building sites for several years utilizing various forms of monetisation. Ebay Partner Network has been my best performer. Still have several old BANS (Build A Niche Store) sites which perform well.....strangely enough.
I originally got involved in earlier versions of Classipress and Auction2Post looking for an alternative to the BANS software. In early 2012, I decided to have a crack at modifying Auction2Post (for custom post-types) due to its huge potential. There is simply no other wordpress plugin like it using eBay's API. It is a premium plugin and unique in many ways. One of the positive things about A2P is that it doesn't have a huge footprint all over the internet unlike the old BANS software which was flogged to death resulting in many sites being de-indexed.
The original owner of A2P lost interest in the plugin and didn't provide any updates for over 2 years .....hence my attempts to create my own mods to his original plugin.
*NB. In late 2012, I purchased the rights to auction2post and the associated Zixby group of software. I did this in conjunction with another a2p member. My modded auction2post has now been named auction2press.
Modifying software and continuing to learn on a daily basis.